Heterostructure (IMAGE) University of Washington Caption This is an illustration of the strong valley exciton interactions and transport in a 2-D semiconductor heterostructure. Credit Kyle Seyler, Pasqual Rivera Usage Restrictions Must include credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.